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Why does my toe plate connection fail plate bending regardless of the plate thickness?

Tekla Connection Designer - Not version-specific

Solution

This toe plate connection will have a Mode 1 failure.
 
Image
toeplate.png
To ensure that there is sufficient rotational capacity in the connection for it to be considered as "simple", only Mode 1 failure [Complete End Plate Yielding] is allowed.
If other failure modes become critical the following parameters can be adjusted so that Mode 1 becomes the critical failure mechanism:

 

  • Bolt gauge
  • Bolt pitch
  • Bolt diameter
  • Bolt end distances
  • Toe plate/end plate thickness
If you refer to the BCSA 207/95 Joints in Steel Construction: Moment Connections - P18 then this identifies the failure modes.
Mode 1 (thin plates/strong bolts) >>>>>>> Mode 3 (thick plates/weak bolts).
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